High-mettled is a term that is commonly used to describe individuals who possess a strong, courageous, and independent personality. There are quite a few words that can be used as synonyms for the term high-mettled. Some of these words include spirited, bold, doughty, gallant, fearless and intrepid. All of these words are used to describe individuals who are brave and willing to take risks in order to achieve their goals. They are fearless and determined and are willing to stand up for what they believe in. These words are often used to describe heroes and individuals who have made significant contributions to society.